Color statuses in change list items

Adds a "flat" mode to gr-change-status that changes the styling of the
chip to emulate a flat Material button, and uses that element in the
change list.

Bug: Issue 8362
Change-Id: I23814d2d6e291821ed3c8a90d75b0d4a1d2b1ac3
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
index b029d46..d594297 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-item/gr-change-list-item.js
@@ -29,9 +29,9 @@
         type: String,
         computed: '_computeChangeURL(change)',
       },
-      status: {
-        type: String,
-        computed: 'changeStatusString(change)',
+      statuses: {
+        type: Array,
+        computed: 'changeStatuses(change)',
       },
       showStar: {
         type: Boolean,